Process for producing maleic anhydride

Details Process for producing maleic anhydride Process for producing maleic anhydride

1983-12-28

1985-05-07

Jiles, Henry R.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

502209, C07D30760

Patent

active

045159734

ABSTRACT:
Maleic anhydride is produced by the oxidation of a nonaromatic hydrocarbon having at least four carbon atoms in a straight chain with molecular oxygen or a molecular oxygen-containing gas in the vapor phase in the presence of a phosphorus-vanadium mixed oxide catalyst. Such catalysts are prepared by contacting a tetravalent vanadium compound, dissolved in an aqueous, non-oxidizing acid medium, with crystalline diphosphoric acid to form a phosphorus-vanadium mixed oxide catalyst precursor. The resulting catalyst precursor-containing solution is subjected to a series of concentration/dilution cycles to induce crystallization of the catalyst precursor. The crystals are collected, dried, formed into desired structures, and calcined at temperatures from about 300.degree. C. to about 600.degree. C.

REFERENCES:
patent: 3293268 (1966-12-01), Bergman et al.
patent: 4085122 (1978-04-01), Stefani et al.
patent: 4100106 (1978-07-01), Stefani et al.
Malowan, Inorganic Synthesis, vol. III, Editor, L. Audrieth, McGraw-Hill, N.Y., (1950), pp. 96-98.

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